Existential Defense
This game is from ldjam.com, which is currently unavailable.
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You can try viewing the original page on Web Archive (may not load correctly).
A tower defense game in which you play a wizard. You need to cast spells or interact with things to strengthen your defense by magical creatures. But that's not so easy because you have to reveal your own life essences that you lose when opposing knights break through your defense to summon the monsters.